High-tension transformer



"septl z g' um H. KRESS HIGH TENSION TmmsFoRlan F11od.Avr11 9 1923Patented Sept. 2, V1924.

UNITED STATES PATENT y oFFlcE.

HIGH-TENSION TRANSFORQMER.

Application led April 9, 1923. Serial `No. 630,915.

To all whom ztvmay conce'rvm.

Be it known that I, HUBERT Kauss, a citizen of Germany, residing at-Frankforton-the-Main, Germany, have invented cer- 'tain new and usefulImprovements in High- Tension Transformers, of which the following is aspecification.

This 'invention is an improvement in high tension transformers of thatkind in which the transmission of energy from the generator or the liketo the, high tension windings or secondary coils or conversely iseffected by one or more intermediatelinks suitable for transmissionof'electro-magnetic energy, such as transformers, condensers or thelike, which can maintain a definite potential given to them.

According to the present invention the energy transmitting link is`constituted by the iron core of the transformer itself, which isstrongly insulated from the low tension or exciting winding and from theearth. The

n high tension winding is subdivided into two electrically connectedsections between which the exciting winding is arranged on and stronglyinsulated from, the iron core which is controlled as regards itspotential and insulated from the earth. This results in a simplerconstruction and in considerable economies in material.v

Three differentconstructions according to the invention are illustratedby way of example in the accompanying drawing.

Figure 1 shows a transformer for, say, 200 kilovolt secondary tension.

Figure 2 shows a transformer for say 200 kilovolt in which however thearrangement ofthe windings is slightly different from that shown inFigure 1.

Figure 3 shows a transformer ink which in front of the high tensiontransformer a help-transformer is connected.

The left hand side of each figure gives the connection diagram, whilstthe right handside shows more fully the construction. The invention isembodied in each half of the figures, so that'either the right or theleft hand .side can be omitted.

In all the three constructions (Figures l-S), the high tension windingis subdivided into two parts a and b. The exciting winding d is arrangedbetween them onanopen or closed iron corea.

The iron core is Ainsulated. from the earth, this being done forinstance by insulators m supporting the casing Z. v

If in the connection according to Figure 1 the potential differencebetween the secondary terminals my y of the' transformer, which isearthed at e be 200 kilovolts, the potential values at various pointsvof the transformer will be those given in the unbracketed figures. Apotential of 50 kilovolts is given to the iron core bythe connection n.The potential differences between the important points of the hightension windings a, b, iron core c or casing Z and the exciting windingd are given in brackets. It will be seen that thelpotential differenceat no point exceeds 50 kilovolts.

In Figure l the two central turns f and of the high tension windings a bare tobe insulated from the low tension winding d,

'b is electrically connected to the inner end f of the winding a by theconductor g or preferably by means ofl the iron core. The potential atthe central turn 7L of the winding b will then be zero, so that this endcan be connected to the exciting winding d, and nee-d not to beinsulated from it. The winding d can therefore be brought close to theend h of the winding b, so that insulation at that point will not benecessary.

The transformer in Figure 3 which is built say for 300 kilovolts, is inits upper part a b o d, a transformer according to Figure 2. Th'eexciting winding d is not however supplied directly from a line circuitor tension current which excites the coil d;

Owing to the connection to the inner ends of the windingsa and o, ahigher potential (5() kilovolts) is superposed over the low tension ofthe exciter windings d d',

Also in the construction in Figure 3, the potential difference isnowhere higher than 50 kilovolts. V, l

What I claim is:

1. A'high tension transformer havin a high tension winding, an excitingwinding and an iron core, said hi h tension winding being divided intotwo e ectrically connected'sections, said exciting winding beingarranged between said sections and highly insulated from said core, andsaid core being insulated from earth and given a predetermined potentialwith respect thereto.

2. Al high tension transformer including a high tension winding dividedinto two spaced electrically connected sections, an iron coreinsulatedfrom earth and having a predetermined otential in respect thereto, anexciting win ing arranged between the said sections and highly insulatedfrom said core, one end of said high tension winding being at groundpotential, situated between the said Asectionsand adjacent said excitinwinding whereby no-insulation is requir between said exciting windingand one section of said high tenslon winding.

3. A high tension transformer including a high tension divided into two"spaced sections, an iron core insulated from earth, and having'apredetermined potential with respect thereto an excitingwinding arrangedbetween said sections and highly insulated from said core, one end ofsaid 'high tension windin bein at zero potential and adjacent saiexciting winding, and the two sections of said hi h tension winding4bleing connectedthroug said core.

'a high tensionwinding divided into two electrically connected sections,an iron core .insulated from earth land havin a'predetermined potentialwith respect t ereto, an

high tension transformer including v? exciting wlnding, highly insulatedfrom said core, arranged between said sections, onel end of said hightension winding being given a zero potential arranged ad acent andconnected to said exciting win l In testimony whereof'I aix my signaturevin presence of two witnesses.V Y 4 f Y HUBERTKRESS. ,Witnessesz YGrammar)v Hiinnns, Cam. Rrrz.-

